Data Sheet
FEATURES
Very low supply current: 13 μA typical
Low offset voltage: 15 μV maximum
Offset voltage drift: 20 nV/°C
Single-supply operation: 1.8 V to 5.5 V
High PSRR: 110 dB minimum
High CMRR: 110 dB minimum
Rail-to-rail input/output
Unity-gain stable
Extended industrial temperature range
1.8 V, Micropower, Zero-Drift,
Rail-to-Rail Input/Output Op Amps
ADA4051-1/ADA4051-2
PIN CONFIGURATIONS
OUT
1
V–
2
+IN
3
ADA4051-1
TOP VIEW
(Not to Scale)
5
V+
4
–IN
Figure 1. 5-Lead SOT-23 (RJ-5)
+IN
1
V–
2
–IN
3
5
ADA4051-1
TOP VIEW
(Not to Scale)
V+
4
OUT
V–
4
5
+IN B
Figure 3. 8-Lead MSOP (RM-8)
OUT A 1
–IN A 2
+IN A 3
V– 4
8 V+
ADA4051-2
TOP VIEW
(Not to Scale)
7 OUT B
6 –IN B
5 +IN B
08056-065
NOTES
1. IT IS RECOMMENDED THAT THE
EXPOSED PAD BE CONNECTED TO V–.
Figure 4. 8-Lead LFCSP (CP-8-13)
GENERAL DESCRIPTION
The
ADA4051-1/ADA4051-2
are CMOS, micropower, zero-
drift operational amplifiers utilizing an innovative chopping
technique. These amplifiers feature rail-to-rail input/output
swing and extremely low offset voltage while operating from a
1.8 V to 5.5 V power supply. In addition, these amplifiers offer
high power supply rejection ratio (PSRR) and common-mode
rejection ratio (CMRR) while operating with a typical supply
current of 13 μA per amplifier. This combination of features
makes the
ADA4051-1/ADA4051-2
amplifiers ideal choices for
battery-powered applications where high precision and low
power consumption are important.
The
ADA4051-1/ADA4051-2
are specified for the extended
industrial temperature range of −40°C to +125°C. The
ADA4051-1
amplifier is available in 5-lead SOT-23 and 5-lead SC-70 packages.
The
ADA4051-2
amplifier is available in an 8-lead MSOP and an
8-lead LFCSP.
The
ADA4051-1/ADA4051-2
are members of a growing series
of zero-drift op amps offered by Analog Devices, Inc. Refer to
Table 1 for a list of these devices.
Table 1. Op Amps
Supply
Single
Dual
Quad
Low Power, 5 V
AD8538
AD8539
5V
AD8628
AD8629
AD8630
16 V
AD8638
AD8639
Rev. C
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license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
08056-001
Pressure and position sensors
Temperature measurements
Electronic scales
Medical instrumentation
Battery-powered equipment
Handheld test equipment
Figure 2. 5-Lead SC-70 (KS-5)
OUT A
1
–IN A
2
+IN A
3
8
V+
OUT B
–IN B
ADA4051-2
TOP VIEW
(Not to Scale)
7
6
08056-066
APPLICATIONS
08056-064
ADA4051-1/ADA4051-2
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics—1.8 V Operation ............................ 3
Electrical Characteristics—5 V Operation................................ 5
Absolute Maximum Ratings............................................................ 7
Data Sheet
Thermal Resistance .......................................................................7
Power Sequencing .........................................................................7
ESD Caution...................................................................................7
Typical Performance Characteristics ..............................................8
Theory of Operation ...................................................................... 17
Input Voltage Range ................................................................... 18
Output Phase Reversal ............................................................... 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 20
REVISION HISTORY
3/16—Rev. B to Rev. C
Changed CP-8-2 to CP-8-13 ........................................ Throughout
Changes to Figure 4 .......................................................................... 1
Changes to Offset Voltage Parameter and Input Resistance
Parameter, Table 2............................................................................. 3
Changes to Offset Voltage Parameter and Input Resistance
Parameter, Table 3............................................................................. 5
Changes to Table 5 ............................................................................ 7
Updated Outline Dimensions ....................................................... 19
Changes to Ordering Guide .......................................................... 20
1/10—Rev. A to Rev. B
Added ADA4051-1, 5-Lead SC-70 Package .................... Universal
Added Figure 2; Renumbered Sequentially .................................. 1
Changes to Figure 4 and General Description Section ............... 1
Changes to Electrical Characteristics—1.8 V Operation Section
and Table 2 ......................................................................................... 3
Changes to Electrical Characteristics—5 V Operation Section
and Table 3 ......................................................................................... 4
Changes to Table 5 ............................................................................ 5
Updated Outline Dimensions ....................................................... 17
Changes to Ordering Guide .......................................................... 18
10/09—Rev. 0 to Rev. A
Added ADA4051-1, 5-Lead SOT-23 Package ................. Universal
Added ADA4051-2, 8-Lead LFCSP Package .................. Universal
Changes to the Features and General Description Section,
Added Figure 1 and Figure 3............................................................1
Moved Electrical Characteristics—1.8 V Operation Section .....3
Changes to Offset Voltage Parameter and Supply Current per
Amplifier Parameter, Table 2 ...........................................................3
Moved Electrical Characteristics—5 V Operation Section .........4
Changes to Offset Voltage Parameter and Supply Current per
Amplifier Parameter, Table 2 ...........................................................4
Changes to Thermal Resistance Section and Table 5 ...................5
Changes to Figure 22 and Figure 25................................................9
Changes to Theory of Operation Section.................................... 15
Updated Outline Dimensions ....................................................... 17
Changes to Ordering Guide .......................................................... 18
7/09—Revision 0: Initial Version
Rev. C | Page 2 of 22
Data Sheet
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—1.8 V OPERATION
V
SY
= 1.8 V, V
CM
= V
SY
/2 V, T
A
= 25°C, R
L
= 100 kΩ to GND, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
ADA4051-2
ADA4051-1
Offset Voltage Drift
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large-Signal Voltage Gain
Symbol
V
OS
0 V ≤ V
CM
≤ 1.8 V
0 V ≤ V
CM
≤ 1.8 V
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
I
OS
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
0 V ≤ V
CM
≤ 1.8 V
−40°C ≤ T
A
≤ +125°C
R
L
= 10 kΩ to V
CM
,
0.1 V ≤ V
OUT
≤ V
SY
− 0.1 V
−40°C ≤ T
A
≤ +125°C
0
105
100
106
100
Test Conditions/Comments
Min
ADA4051-1/ADA4051-2
Typ
Max
Unit
2
2
0.02
5
10
∆V
OS
/∆T
I
B
15
17
27
0.1
50
200
100
150
1.8
CMRR
A
VO
125
130
µV
µV
µV
µV/°C
pA
pA
pA
pA
V
dB
dB
dB
dB
Input Resistance
Differential Mode
Common Mode
Input Capacitance, Differential Mode
Input Capacitance, Common Mode
OUTPUT CHARACTERISTICS
Output Voltage High
R
INDM
R
INCM
C
INDM
C
INCM
V
OH
R
L
= 100 kΩ to V
CM
−40°C ≤ T
A
≤ +125°C
R
L
= 10 kΩ to V
CM
−40°C ≤ T
A
≤ +125°C
R
L
= 100 kΩ to V
CM
−40°C ≤ T
A
≤ +125°C
R
L
= 10 kΩ to V
CM
−40°C ≤ T
A
≤ +125°C
V
OUT
= V
SY
or GND
f = 1 kHz, G = 10
1.8 V ≤ V
SY
≤ 5.5 V
−40°C ≤ T
A
≤ +125°C
V
OUT
= V
SY
/2
V
OUT
= V
SY
/2
−40°C ≤ T
A
≤ +125°C
SR+
SR−
t
S
GBP
Φ
M
CS
R
L
= 10 kΩ, C
L
= 100 pF, G = 1
R
L
= 10 kΩ, C
L
= 100 pF, G = 1
To 0.1%, V
IN
= 1 V p-p,
R
L
= 10 kΩ, C
L
= 100 pF
C
L
= 100 pF, G = 1
C
L
= 100 pF, G = 1
V
IN
= 1.7 V, f = 100 Hz
Rev. C | Page 3 of 22
8
250
2
5
1.796
1.79
1.76
1.7
1.799
1.796
1
3
13
1
110
106
135
3
9
20
40
MΩ
GΩ
pF
pF
V
V
V
V
mV
mV
mV
mV
mA
Ω
dB
dB
17
18
20
µA
µA
µA
V/µs
V/µs
µs
kHz
Degrees
dB
Output Voltage Low
V
OL
Short-Circuit Current
Closed-Loop Output Impedance
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current per Amplifier
ADA4051-2
ADA4051-1
DYNAMIC PERFORMANCE
Slew Rate
Settling Time
Gain Bandwidth Product
Phase Margin
Channel Separation
I
SC
Z
OUT
PSRR
I
SY
13
15
0.04
0.03
120
115
40
140
ADA4051-1/ADA4051-2
Parameter
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
Symbol
e
n
p-p
e
n
i
n
Test Conditions/Comments
f = 0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
Min
Typ
1.96
95
100
Data Sheet
Max
Unit
µV p-p
nV/√Hz
fA/√Hz
Rev. C | Page 4 of 22
Data Sheet
ELECTRICAL CHARACTERISTICS—5 V OPERATION
V
SY
= 5.0 V, V
CM
= V
SY
/2 V, T
A
= 25°C, R
L
= 100 kΩ to GND, unless otherwise noted.
Table 3.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
ADA4051-2
ADA4051-1
Offset Voltage Drift
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large-Signal Voltage Gain
Symbol
V
OS
0 V ≤ V
CM
≤ 5 V
0 V ≤ V
CM
≤ 5 V
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
I
OS
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
0 V ≤ V
CM
≤ 5 V
−40°C ≤ T
A
≤ +125°C
R
L
= 10 kΩ to V
CM
,
0.1 V ≤ V
OUT
≤ V
SY
− 0.1 V
−40°C ≤ T
A
≤ +125°C
Test Conditions/Comments
ADA4051-1/ADA4051-2
Min
Typ
Max
Unit
2
2
0.02
20
40
0
110
106
115
106
8
250
2
5
∆V
OS
/∆T
I
B
15
17
27
0.1
70
200
100
150
5
CMRR
A
VO
135
135
µV
µV
µV
µV/°C
pA
pA
pA
pA
V
dB
dB
dB
dB
MΩ
GΩ
pF
pF
V
V
V
V
mV
mV
mV
mV
mA
Ω
dB
dB
Input Resistance
Differential Mode
Common Mode
Input Capacitance, Differential Mode
Input Capacitance, Common Mode
OUTPUT CHARACTERISTICS
Output Voltage High
R
INDM
R
INCM
C
INDM
C
INCM
V
OH
R
L
= 100 kΩ to V
CM
−40°C ≤ T
A
≤ +125°C
R
L
= 10 kΩ to V
CM
−40°C ≤ T
A
≤ +125°C
R
L
= 100 kΩ to V
CM
−40°C ≤ T
A
≤ +125°C
R
L
= 10 kΩ to V
CM
−40°C ≤ T
A
≤ +125°C
V
OUT
= V
SY
or GND
f = 1 kHz, G = 10
1.8 V ≤ V
SY
≤ 5.5 V
−40°C ≤ T
A
≤ +125°C
V
OUT
= V
SY
/2
V
OUT
= V
SY
/2
−40°C ≤ T
A
≤ +125°C
SR+
SR−
t
S
GBP
Φ
M
CS
R
L
= 10 kΩ, C
L
= 100 pF, G = 1
R
L
= 10 kΩ, C
L
= 100 pF, G = 1
To 0.1%, V
IN
= 1 V p-p,
R
L
= 10 kΩ, C
L
= 100 pF
C
L
= 100 pF, G = 1
C
L
= 100 pF, G = 1
V
IN
= 4.99 V, f = 100 Hz
4.996
4.985
4.96
4.9
4.998
4.99
1
9
15
1
4
13
30
90
Output Voltage Low
V
OL
Short-Circuit Current
Closed-Loop Output Impedance
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current per Amplifier
ADA4051-2
ADA4051-1
DYNAMIC PERFORMANCE
Slew Rate
Settling Time
Gain Bandwidth Product
Phase Margin
Channel Separation
I
SC
Z
OUT
PSRR
I
SY
110
106
135
13
15
17
18
20
µA
µA
µA
V/µs
V/µs
µs
kHz
Degrees
dB
0.06
0.04
110
125
40
140
Rev. C | Page 5 of 22
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